<script setup lang="ts">
import { computed, ref, watch } from 'vue'

// 定义水果对象的类型
interface Fruit {
  id: number
  icon: string
  isChecked: boolean
  num: number
  price: number
}

const FRUIT = 'fruit'
let list: Fruit[] = []
const res = localStorage.getItem(FRUIT)
if (res === null) {
  list = [
    {
      id: 1,
      icon: 'https://hongm-1312445828.cos.ap-nanjing.myqcloud.com/ll.png',
      isChecked: true,
      num: 2,
      price: 6
    },
    {
      id: 2,
      icon: 'https://hongm-1312445828.cos.ap-nanjing.myqcloud.com/smt.png',
      isChecked: false,
      num: 7,
      price: 20
    },
    {
      id: 3,
      icon: 'https://hongm-1312445828.cos.ap-nanjing.myqcloud.com/tg.png',
      isChecked: false,
      num: 3,
      price: 40
    },
    {
      id: 4,
      icon: 'https://hongm-1312445828.cos.ap-nanjing.myqcloud.com/xg.png',
      isChecked: false,
      num: 10,
      price: 3
    },
    {
      id: 5,
      icon: 'https://hongm-1312445828.cos.ap-nanjing.myqcloud.com/yl.png',
      isChecked: false,
      num: 20,
      price: 34
    }
  ]
} else {
  list = JSON.parse(res)
}

// 水果列表
const fruitList = ref(list)

watch(
  fruitList,
  () => {
    localStorage.setItem(FRUIT, JSON.stringify(fruitList.value))
  },
  {
    deep: true
  }
)

const del = (id: number) => {
  fruitList.value = fruitList.value.filter((i) => {
    return i.id !== id
  })
}

const addbyID = (id: number) => {
  const item = fruitList.value.find((i) => i.id == id)
  item!.num++
}
const decbyID = (id: number) => {
  const item = fruitList.value.find((i) => i.id == id)
  if (item!.num === 1) {
    return
  }
  item!.num--
}

const isCheckedAll = computed({
  get() {
    return fruitList.value.every((i) => i.isChecked)
  },
  set(value) {
    return fruitList.value.forEach((i) => (i.isChecked = value as boolean))
  }
})

const totalNum = computed(() => {
  return fruitList.value.filter((i) => i.isChecked).reduce((pre, cur) => pre + cur.num, 0)
})
const totalPrice = computed(() => {
  return fruitList.value
    .filter((i) => i.isChecked)
    .reduce((pre, cur) => pre + cur.price * cur.num, 0)
})
</script>

<template>
  <div class="app-container" id="app">
    <!-- 顶部banner -->
    <div class="banner-box">
      <img src="https://hongm-1312445828.cos.ap-nanjing.myqcloud.com/sg_top.png" alt="" />
    </div>
    <!-- 面包屑 -->
    <div class="breadcrumb">
      <span>🏠</span>
      /
      <span>购物车</span>
    </div>
    <!-- 购物车主体 -->
    <div v-if="fruitList.length > 0" class="main">
      <div class="table">
        <!-- 头部 -->
        <div class="thead">
          <div class="tr">
            <div class="th">选中</div>
            <div class="th th-pic">图片</div>
            <div class="th">单价</div>
            <div class="th num-th">个数</div>
            <div class="th">小计</div>
            <div class="th">操作</div>
          </div>
        </div>
        <!-- 身体 -->
        <div class="tbody">
          <div v-for="item in fruitList" :key="item.id" class="tr active">
            <div class="td">
              <input v-model="item.isChecked" type="checkbox" checked />
            </div>
            <div class="td">
              <img :src="item.icon" alt="" />
            </div>
            <div class="td">{{ item.price }}</div>
            <div class="td">
              <div class="my-input-number">
                <button @click="decbyID(item.id)" class="decrease">-</button>
                <span class="my-input__inner">{{ item.num }}</span>
                <button @click="addbyID(item.id)" class="increase">+</button>
              </div>
            </div>
            <div class="td">{{ item.price * item.num }}</div>
            <div @click="del(item.id)" class="td"><button>删除</button></div>
          </div>
        </div>
      </div>
      <!-- 底部 -->
      <div class="bottom">
        <!-- 全选 -->
        <label class="check-all">
          <input v-model="isCheckedAll" type="checkbox" />
          全选
        </label>
        <div class="right-box">
          <!-- 所有商品总价 -->
          <span class="price-box"
            >总价&nbsp;&nbsp;:&nbsp;&nbsp;¥&nbsp;<span class="price">{{ totalPrice }}</span></span
          >
          <!-- 结算按钮 -->
          <button class="pay">结算( {{ totalNum }})</button>
        </div>
      </div>
    </div>
    <!-- 空车 -->
    <div v-else class="empty">🛒空空如也</div>
  </div>
</template>

<style scoped>
@import './style/inputnumber.css';
@import './style/index.css';
</style>
